Teenths to manning h



(No Model.)

J. M. FARMER.

KEY PASTENER. No. 452,779. Patented May 26, 1891.

UNITED STATES JULIUS M. FARMER, OF MILWAUKEE,

IVISOONSIN, ASSIGNOR OF NINE-SIX- KEY FASTENER.

SPECIFICATION forming part of Letters Patent No. 452,779, dated May 26,1891.

Application filed September 9, 1890. serial No. 364,436. (No model.)

To all whom it may concern.-

Be it known that I, JULIUS M. FARMER, of Milwaukee, in the county ofMilwaukee, and in the State of VVisconsimhave invented certain new anduseful Improvements in Safety Attachment for Lock-Keys; and I do herebydeclare that the following is a full, clear, and exact descriptionthereof.

My invention relates to keys which arecmployed in shooting or throwingthe bolts of door-locks, &c.; and my invention consistsin certainpeculiar and novel features of construction and arrangement ashereinafter described, and pointed out in the appended claims.

In the drawings, Figure l is a side elevation of a lock with my improvedkey applied thereto, the casing of the lock being partly broken away toshow the position of the key and its safety attachment in the lock. Fig.2 is a sectional View of the same on the line 2 2 of Fig. 1. Fig. 3 is aside elevation of a key with my improvements applied thereto, the latterbeing shown partly in longitudinal section. Fig. at is a transversesection of the same on the line i 4 of Fig. 3.

The objects of my invention are to provide means whereby keys shall beso retained in their looks as to prevent all possibility of re movaltherefrom by persons on the outside of the door, and whereby thekey-hole shall be closed so as to prevent mischievous tampering with thelook as well as Visualinspection of the apartment through the key-hole.These results I attain by virtue of the construction which I will nowproceed to describe.

Referring by letter to the drawings, A designates the casing, 13 thebolt, and O the tumbler, of an ordinary door-lock. This particular formof lock is shown simply for purposes of illustration, and, as will beobvious from the ensuing description, my improved key is applicable toany form or style of lock having the usual koy-holes a a in its casingaside from the internal locking mechanism.

D designates the stem, (Z the ring or loop, cl the barrel, and (Z thebit, of an ordinary key. The stem of the key is preferably angular incross-section and is formed on one 50 side with a number of teeth orserrations (Z E designates a tubular slide or sleeve which surrounds thestem D and which is preferably cast in one piece into the required formand having lugs c c at one side, through which passes a pivot pin orrivet c. This rivet or 5 pin extends also through apawlF midway of itslength, the said pawl being thus interposed between the said lugs e e.The tip of the pawl F is held normally in engagement with the teeth orserrations d of the stem D by aleaf-spring e one end of which is securedto the adjace11t side of the slide E, while its free end presses upwardagainst the free arm of the pawl. The outer end of the stem Dis formedwith a shoulder g, and between this shoulder and the adjacent end of theslide or sleeve E is interposed a spiral spring G, which surrounds thestem and which tends to force the slide toward a shoulder g at thejuncture ofthe stem D and barrel cl of the key. From one side of theslide E projects an elongated guard or keeper II, which is either formedupon or secured to the slide, and which, when the latter is in properposition upon the stem of the key, extends at right angles to the bit 75 d of said key. (See Figs. 1, 2, and 4:.) This guard extends wellforward from the slide, as

is best shown in Fig. 2.

1 The operation of the above-described arrangement is as follows: Thekey is inserted into the key-hole in the usual manner and is given apartial or complete revolution so as to shoot or throw the bolt. Thisrevolution brings the guard II into pendent position in alignment withthe straight portion of the key-hole, an d the spring Gimmediatelythrows the front end of the guard into said. portion of the key-hole,the bit of the key extending at right angles to the said guard, as shownin Figs. 1, 2, and 4. The tip of the 'pawl F 1s held in engagement withone of the serrations 61 adjacent to the shoulder g, and thus preventsthe guard or keeper from being forced backward out of the key-hole,while the position of the guard prevents the key from being turnedaxially by nippers or other instruments applied to the outer end of thebarrel d, this being due to the angular form of the stem and slide. Thenthe door is to be unlocked, pressure is applied to the pawl F, so we asto lift the tip of the pawl out of engagement with the serrations in thekey-stem, and

the slide E is moved back so as to draw the guard out of the key-hole,whereupon the key can be readily turned to retract the bolt and so as toremove the key from the look.

It is obvious that, if desired, the spring G may be dispensed with, asthe pawl and serrations or ratchet will prevent the guard from beingforced out of thekey-hole, and other minor changes in details ofconstruction may be made Without departing from the essential spirit ofmy invention.

Having thus described my invention, what I claim as new therein, anddesire to secure by Letters Patent, is- I 1. An improved attachment forlock-keys, comprising a slide adapted to Work upon the stem of a key andcarrying a guard to enter the keyhole, and having also a catch to engagethe stem of the key and thus prevent displacement of the guard fromwithin the key-hole, substantially as set forth.

2. The combination, with a lock-key having its stem provided withratchet-teeth or serrations, of a slide working upon the stem andcarrying a spring-pressed pawl to engage said teeth or serrations, and aguard carried by said slide and arranged to enter the key-hole,substantially as set forth.

3. The combination, with a lock-key having its stem provided withratchet-teeth or serrations, of a slide working upon said stem andhaving a spring-pressed pawl to engage said teeth or serrations, a guardcarried by said slide and arranged to enter the key-hole, and a springsurrounding the key-stem and serving to move the slide so as tobring theguard into the key-hole, substantially as set forth.

In testimony that I claim the foregoing I have hereunto set my hand, atMilwaukee, in the county of Milwaukee and State of Wisconsin, in thepresence of two witnesses.-

JULIUS M. FARMER.

Witnesses:

H. G. UNDERWOOD, WM. KLUG.

